Add sector definitions

...logues_comparisons/.ipynb_checkpoints/BC-checkpoint.ipynb

...logues_comparisons/.ipynb_checkpoints/CO-checkpoint.ipynb

...ogues_comparisons/.ipynb_checkpoints/NH3-checkpoint.ipynb

...ogues_comparisons/.ipynb_checkpoints/NOx-checkpoint.ipynb

...ogues_comparisons/.ipynb_checkpoints/SO2-checkpoint.ipynb

...logues_comparisons/.ipynb_checkpoints/test-checkpoint.txt

scenario comparison/catalogues_comparisons/BC.ipynb

scenario comparison/catalogues_comparisons/CO.ipynb

scenario comparison/catalogues_comparisons/NH3.ipynb

scenario comparison/catalogues_comparisons/NOx.ipynb

scenario comparison/catalogues_comparisons/OC.ipynb

scenario comparison/catalogues_comparisons/SO2.ipynb

scenario comparison/catalogues_comparisons/test.txt